"Start fights like one, get treated like one," Bigby simply says. Though it's likely an odd combination - verbally giving Jason shit, but at the same time still helping him. Because the flipping off and the words Jason is saying do absolutely nothing to convince Bigby to do anything else here than approach the other, starting to wrap the makeshift bandages around the wound. He figures it likely stings, since he has to make sure to wrap them tightly to keep Jason from losing any more blood than he already has, but..

Hey, he is a big boy. He can handle it, if he's handling the rest of his current state. So he's not even giving a warning for it, just continuing his work.

Bigby doesn't say anything else at first while he's busy wrapping the bandages, like he's too focused on that to add any chatter, but then--

"There. Should keep you from bleeding out, at least. If you insist on just letting it heal naturally."